Low-energy positron–hydrogen molecule scattering

1982 ◽  
Vol 60 (4) ◽  
pp. 597-600 ◽  
Author(s):  
Sukanya Sur ◽  
A. S. Ghosh
Keyword(s):  
Cross Sections ◽  
Effective Potential ◽  
Qualitative Agreement ◽  
Hydrogen Molecule ◽  
Low Energy ◽  
Total Cross Sections ◽  
Model Potentials ◽  
Theoretical Predictions ◽  
Molecule Scattering

The method of Hara using two centre formalism has been employed to investigate positron–hydrogen molecule scattering at low incident energies. Two model potentials have been used to see the importance of the choice of effective potential. It has been found that the total cross sections are sensitive to the details of the effective potential. The present results are in qualitative agreement with measured values and other existing theoretical predictions.

Differential and total cross sections of mutual neutralization in low-energy collisions of isotopes ofH++H−

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
Sifiso M. Nkambule ◽  
Nils Elander ◽  
Åsa Larson ◽  
Julien Lecointre ◽  
Xavier Urbain
Keyword(s):  
Cross Sections ◽  
Low Energy ◽  
Total Cross Sections

scholarly journals Anomalous enhancements of low-energy fusion rates in plasmas: the role of ion momentum distributions and inhomogeneous screening

Open Physics ◽  
2009 ◽  
Vol 7 (3) ◽  
Author(s):  
Massimo Coraddu ◽  
Marcello Lissia ◽  
Piero Quarati
Keyword(s):  
Cross Sections ◽  
Thermal Effects ◽  
Quantum Effect ◽  
Reaction Rates ◽  
Low Energy ◽  
Electron Screening ◽  
Quantum Uncertainty ◽  
Spatial Fluctuations ◽  
Theoretical Predictions

AbstractNon-resonant fusion cross-sections significantly higher than corresponding theoretical predictions are observed in low-energy experiments with deuterated matrix target. Models based on thermal effects, electron screening, or quantum-effect dispersion relations have been proposed to explain these anomalous results: none of them appears to satisfactory reproduce the experiments. Velocity distributions are fundamental for the reaction rates and deviations from the Maxwellian limit could play a central role in explaining the enhancement. We examine two effects: an increase of the tail of the target Deuteron momentum distribution due to the Galitskii-Yakimets quantum uncertainty effect, which broadens the energy-momentum relation; and spatial fluctuations of the Debye-Hückel radius leading to an effective increase of electron screening. Either effect leads to larger reaction rates especially large at energies below a few keV, reducing the discrepancy between observations and theoretical expectations.

scholarly journals Ground State Positronium Formation Cross Sections for Scattering of Positrons from Li

1991 ◽  
Vol 44 (5) ◽  
pp. 515 ◽  
Author(s):  
KK Mukherjee ◽  
N Ranjit Singh ◽  
Keka Basu Choudhury ◽  
PS Mazumdar ◽  
S Brajamani
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Ground State ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Predictions

Total cross sections for positronium formation in e+-Li scattering have been studied in the framework of the distorted wave approximation in the energy range 1-50 eV by taking consistent account of the effect of the target distortion. The results are compared with existing theoretical predictions.

Absolute Total Cross Sections for the Scattering of Low-Energy Electrons by Rubidium, Cesium, and Potassium

1971 ◽  
Vol 3 (4) ◽  
pp. 1310-1317 ◽  
Author(s):  
Paul J. Visconti ◽  
James A. Slevin ◽  
Kenneth Rubin
Keyword(s):  
Cross Sections ◽  
Low Energy ◽  
Total Cross Sections ◽  
Low Energy Electrons

scholarly journals Modeling radiative proton-capture reactions in mid-heavy nuclei

2019 ◽  
Vol 23 ◽  
pp. 146
Author(s):  
E. Batziou ◽  
V. Koutsilianou ◽  
L. Stavropoulos ◽  
A. Psaltis ◽  
T. J. Mertzimekis
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Systematic Study ◽  
Low Energy ◽  
Heavy Nuclei ◽  
Proton Capture ◽  
Experimental Conditions ◽  
Energy Regime ◽  
Theoretical Predictions ◽  
Near Future

A systematic study of (p,γ) reactions was carried out using the reaction codes EMPIRΕ, TALYS and NON-SMOKER (web). The calculated (p,γ) cross sections of seed nuclei 89Y, 107,109Ag, 106,108,110Pd, 112Cd, 121,123Sb, 127I, and 133Cs can be used in a three-fold way: (a) perform an intercomparison of the models in a low-energy regime (b) compare existing experimental data to the theoretical predictions and (c) predict cross sections of reactions planned to be studied experimentally in the near future by our group. The results of the study are presented in a concise way focusing on the experimental conditions.

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